Universal hub



FIG. 1 is a perspective view of the universal hub embodying my new design;

FIG. 2 is a front elevational view of the universal hub illustrated in FIG. 1;

FIG. 3 is a side elevational view of the universal hub illustrated in FIG. 1; and,

FIG. 4 is a rear view of the universal hub illustrated in FIG. 1. 

The ornamental design for the universal hub, as shown and described. 